Veronica Biffi (Triest, Italy)

Synthetic X-ray observations of simulated galaxy clusters
When Jan 28, 2013 from 02:00 PM to 03:00 PM
What
  • Special Seminar
Where SH, Lecture hall
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X-ray observations provide us with an increasingly detailed pictured of galaxy clusters, for which a clear interpretation of the underlying physical processes is very challenging. While hydrodynamical simulations can currently address many questions about the cluster dynamics and physics, it is vital to find a direct and faithful way to compare their results to real X-ray observations. By means of the X-ray virtual telescope PHOX we can generate mock X-ray observations out of hydrodynamical simulations of galaxy clusters. In this way, we can address a number of interesting issues, such as the reconstruction of the cluster temperature distribution via spectral analysis or the investigation of scaling relations among global observable properties, e.g. luminosity and temperature. Furthermore I will show an application of the simulator to obtain high-resolution spectra of clusters, such those achievable with upcoming X-ray missions as ASTRO-H or ATHENA, from which a tight constrain on the intra-cluster medium (I CM) non-thermal velocity can be derived. This is particularly important since non-thermal motions in the  ICM are believed, for instance, to play a non-negligible role in the pressure support to the total gravitating mass of galaxy clusters. Additionally, the L-T relation is explored in combination with the ICM velocity diagnostics, offering a promising way to identify disturbed clusters which is complementary to the commonly used morphological classification.